Busting Knuckles and Livers since 2010

Is the auto transmission of your 80 Series having problems or not shifting into one of the gears? Is the OverDrive light on the gauge cluster flashing?  If so, then a trouble code has been stored. Here’s how to enter diagnostic mode to read the code:

Here are the diagrams referenced in the video:

^^^Download this chart^^^

My Number 2 Shift Solenoid was bad.  There are a total of 4 solenoids. Here’s a diagram of their location, as well as TCM, Speed Sensor and TPS sensors: